RT Journal Article SR Electronic T1 The chlorine hypothesis: fact or fiction? JF Occupational and Environmental Medicine JO Occup Environ Med FD BMJ Publishing Group Ltd SP 6 OP 7 DO 10.1136/oem.2006.029850 VO 64 IS 1 A1 M J Nieuwenhuijsen YR 2007 UL http://oem.bmj.com/content/64/1/6.abstract AB